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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c5ee0b5dac8b1919410609485094999af3b45e1395569c3bbfef087ae0ac1f84' 
  AND token = '8bP4OprUSuw8PzzprwUq2HcWh0i+UwH8M5NXJX/EDK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}